Derivatives of thiabenzopyrrocoline, thiabenzopyridocoline and thiazepine



United Statesv Patent DERIVATIVES OF THIABENZOPYRROCOLINE,

AND THIAZE- THIABENZOPYRIDOCOLINE PINE Joseph G. Lombardino, Brooklyn, and William M.

McLamore, Kew Gardens, N.Y., and Gerald D. Laubach, Niantic, Conn., assignors to Chas. Pfizer & Co., Inc., New York, N.Y., a corporation of Delaware for their preparation. More particularly, the present invention is concerned with novel organic nitrogen compounds which possess a unique sulfur-containing heterocyclic ring system. There is also included within the scope of this invention various pharmaceutical compositions which have as their essential active ingredient at least one of the herein described compounds.

The compounds which are included within the purview of this invention are selected from the class having the following general structural formulae:

wherein R is a member of the group consisting of hydroxy, lower alkoxy and alkyl having from one to five carbon atoms and when both R groups are taken together they form a methylenedioxy group, n is an integer in the range of 0-2 inclusive, Y is a member of the group consisting of sulfur, oxosulfur and dioxosulfur, Z is a member of the group consisting of hydrogen and alkyl having from one to eight carbon atoms, R is a member of the group consisting of hydrogen, methyl, chlorine, bromine, amino, hydroxy and methoxy, and R" is a memberof the group consisting of hydrogen and lower alkyl. The system of nomenclature employed throughout this specification is that based on the Patterson system as is indicated by the hereinbefore illustrated formulas for a l-thia-3-oxo-1,2, 3,5,6-pentahydro-IOb-H-benzopyrrocoline, a 1 thia 4- oxo-1,2,3,4,6,7-hexahydro-11b-H benzopyridocoline, a naph [1,2 a] 5 oxo 2,3,4,5,6,7-hexahydro-1lb-H- [l,5a]thiazepine and a 1 thi-a-G-oxo-1,6,8,9-tetrahydrol3b-H-dibenzo-[a,g]pyridocoline, respectively [e.g., see A. M. Patterson and L. T. Capell, The Ring Index, Reinhold Publishing Corporation, New York, N.Y (1940)].

In accordance with the present invention, the aforementioned thiabenzopyrrocoline, thi-abenzopyridocoline, thiazepine and thiadibenzo[a,g]pyridocoline derivatives have been found to possess interesting pharmaceutical properties which render them useful as synthetic medicinals. More particularly, these compounds have been shown to exhibit utility as muscle relaxants as well as tranquilizing or hypotensive agents. Of especial value in this connection are those thiabenzopyrrocolines and thiabenzopyridocolines which have a dimethoxy grouping at the 8,9-, 9,10- and 11,12-positions, respectively.

In accordance with the process for preparing the compounds of invention, an appropriately substituted 3,4-dihydroisoquinoline is condensed with a mercapto- Patented May 23, 1961-.

substituted hydrocarbon carboxylic acid as is illustrated below by the following series of equations wherein R, Z; n, R and R are all as previously defined:

nsonzwnnncoi/ R RI! R R N a N Y In). i

This reaction is most desirably conducted in an inert organic solvent medium at a temperature that is in the range of from about 20 C. to about C. for a period of about two to about 24 hours. Preferred reaction-inert solvents in this connection includes such aromatic hydrocarbons as benzene, toluene, xylene, and the like, as well as water-miscible lower alkanols, such as methanol, ethanol, isopropanol, and the like; N,N-dissubstituted lower aliphatic hydrocarbon carboxamides, such as dimethylformamide, dimethylacetamide, diethylformamide, diethylacetarnide, and the like; and the lower aliphatic hydrocarbon nitri-les, such as acetonitrile, n-propionitrile, and the like. Typical examples of the various mercapto acids which may be employed in this process include. such compounds as mercaptoacetic acid, a-mercapto-' propionic acid, B-mercaptopropionic acid, a-mercapto-n butyric acid, p-mercapto-n-butyric acid, v-mercapto-nbutyric acid, a-mercapto-n-valeric acid, fi-mercapto-nvaleric acid, -mercapto-n-valeric acid, a-mercapto-ncaproic acid, p-mercapto-ncaproic acid, 'y-mercapto-rn caprylic acid, a mercapto n capric acid, omercaptobenzoic acid, o-mercapto-S-toluic acid, o-mercapto-S- chlorobenzoic acid, o-mercapto-S-anthranilic acid, 0- mercapto-S-salicylic acid, and the like. Treatment of the Z-thia compounds so obtained with either one or two moles of perbenzoic acid respectively afiords the corresponding sulfoxides and sulfones.

The starting materials employed in the process of this invention are either readily available commercially or else they are easily prepared in accordance with standard organic procedures previously described in the chemical literature. For instance, the aforementioned 6.7-disubstituted-3,4-dihydroisoquinolines can be conveniently synthesized by any number of known procedures disclosed in the prior art and preferably by employing the method described by E. Spath and H. Epstein [Ber. 59, 2791 (1926)] which, in this case, involves reacting a fl-[3,4- di(substituted)phenylJalkylamine with formic acid fol-.

lowed by a cyclization of the resulting formamide inter mediate with phosphorus pentoxide to atford the desired isoquinoline compound. The mercapto acids employed micerin. amounts that are generally considered to besufiicient to achieve the. desired effects as hereinafter indicated. Moreover, no ..harmful pharmacological side effects have been observed as a result of their administration. The aforementioned central nervous system depressant activity of all these, compounds is well illustrated by a series of tests previously described in the literature and hence, well-knownto those skilled in the art. For instance, the percent decrease in serotonin and norepinephrine blood levels in the brain of the rabbit is determined in accordance with the method of P. Shore et al. [Journal of Pharmacology and Experimental Therapeutics, vol. 122, p. 295 (1958)] and S. Udenfriend et al. [Science, vol. 122, p. 972 (1955)].

In accordanee w-itha method of treatment of the present invention, the herein described thiabenzopyrrocoline, thiabenzopyridocoline, thiazepine and thiadibenzo [a,g] pyridocoline derivatives can be administered to an agitated subject via the oral or parenteral routes as, previously indicated. In general, these compounds are most desirably administered at a dosage level that is in the range of from about 50 mg. to about 500' mg. per day, although it is to be understood that variations will necessarily occur depending upon the weight of the subjectbeing treated and the particular route of administration chosen. Never. theless, a dosage level that is within the range of from about 0.7g. to about 7.0 mg. per kg.;of body weight per' day is most desirably employed in order to achieve efiective results. It is be be appreciated that still other variations may also occur in this respect, depending upon the species of animal being treated and its individual response to said treatment, as well as on the particular type of-formulation chosen and the time period andinterval at which such administration is carried out. In someinst-ances, dosage levels below the lower limitof the aforesaid range may be more than adequate, while in other cases still larger dosages may be employed without causing any harmful or deleterious side effects provided that such higher dosage levels are first divided into several smaller doses that are to .be administered throughout the day.

'In connection with the use of the sulfur-heterocyclic compounds of this invention for the treatment of agitated subjects, it isto be noted that it may be administered alone or in combination with a pharmaceutically acceptable carrier, and that such administration can either be in single or multiple doses. More particularly, the

novel compounds of this invention can be administeredin a wide variety ofdosage forms, i.e., they may be combined A with various pharmaceutically acceptable inert carriers in the form of tablets, capsules, lozenges, troches, hard candies, powders, sprays, aqueous suspensions, in-;

jectable solutions, elixirs, syrups, and -the likeQ Such carriers include solid diluents or fillers, sterile aqueous.

media and various non-toxic organic solvents, More,- over, the oral pharmaceutical compositions may be sweetened and/or flavored by means of various agents of the type commonly employed for such a purpose. In general, the therapeutically-active compounds ofthis invention are present in such dosage forms at concentration levels ranging from about 0.020% to about 90% by weight of the total. composition, i.e., in amounts gen- 4*; tionally, lubricating agents such as magnesium stearate, sodium lauryl sulfate-and talc are often very useful for-- tabletting purposes. Solid compositions of a similar type may also be employed as fillers in soft and hard-shelled gelatin capsules; preferred materials in this connection also include lactose or milksugaras well as high molecular, weightpolyethylene 'glycols. When aqueous suspensionsand/or elixirs aredesirecl v for oral. administration, the essential active ingredient can be combined. with various sweetening and ,flavoringagents, coloring matter. or dyes and, if so desired, emulsifying and/ or suspending agents, together with suchdiluents, as water, ethanol, propylene glycol, glycerin. and various combinations thereof.

For purposes of parenteraladministration, solutions of the herein described organic nitrogen compounds in sesame or peanut oil or in sterile aqueous-propylene glycol solutions may beemployed. Such aqueous solutions erally considered-to be sufficient for providing the desired unit dosage previously indicated.

For purposes of oral administration, tablets contain; ing-various-excipientssuch as sodium citrate, calcium carbonate and; dicaleium phosphate may be employed along-with .various disintegrants such as starchand pref-' erably potato or tapioca starch, alginic acid and certain complex silicates, together with binding agents SllCh as polyvinylpyrrolidone, sucrose, gelatinl and-acaciag addi should be suitably buffered if' necessary and the liquid diluent'rendered isotonicwith sufiicient saline or glucose. These particular solutions are especially suitable forintravenous, intramuscular and subcutaneous injection purposes. In this'connection, the sterile aqueous mediaem: ployed are readily obtained-by standardtechniques well known to those in the art. Forv instance, distilledwaterv is ordinarily used as the liquid diluent and the final preparation is passed, through a suitable. bacterial filter, ,such as a sintered glass filter or a diatomaceous earthor unglazed porcelain filter. Preferred filters of this typeinclude the Berkefeld, the Chamberland and the asbestos disc-metal Seitz filter, wherein the fluid. is sucked through the filter candle into a sterile container with the aid of a suction pump. Needless to say, aseptic conditions must necessarily be maintained throughout such operations which are connected with the preparation of these injectable solutions.

This invention is further illustrated by-the following ex amples, which are not to be construed as imposing any limitations on the scope thereof. On the contrary, it is to be clearly understood that resort may be had to various other embodiments, modifications-and equivalents thereof which readily suggest themselves to those skilled inthe art withoutdepartingfrom the, spirit of the. present invention and/or the scope of the. appended claims.

Example I In a ,25 0, ml. three-necked,. round-bottomed, flask: equipped with a nitrogen-inlet tube and magnetic stirring apparatus and. fitted with a dropping funnel and reflux, condenser. having .a drying I. tubenattached thereto, therewere placed 3.8 g, (0.02 mole) of 6,7-dimethoxy-3,4 dihydroisoquinoline dissolved in.50 ml. of drybenzene. Stirring was commenced and to, the resulting solution; there was then added dropwisea solutionconsistingofi 2.12 g. (0.02 mole) of.B-mercapto-n-propionic acid .dis-' solved inSO ml. of dry benzene. Afterthe addition was 1-. complete, thev reaction mixture wasrefluxed undera nitro-. gen atmosphere for six hours and then allowed to, stand 1 at room temperature for an: additional. 16 hours: The resulting clear yellow solution was then evaporated under: reduced pressure .inorder to remove the benzene, and, the residual orange-colored .oil so obtained was subsequently partitioned between '50 ml. of 20% sodium hydroxide and l00 ml. of;diethyl. ether.- The ether layers Was then separated and saved, while the basic'aqueous layer. was successively extracted with fourml. p011- tions ofdiethyl ether and one-SOmLportion of benzene, before it was discarded. The benzene-ether extracts were then combined and subsequently dried over anhydrousv sodiurnsulfate. After removal of the drying agent bymeans of filtration, the dried filtrate .-was,.concentrated-; under reduced pressure until approximately-one-third of"- its original volume remained. After-allowing-the'con- 1.43 g. (25%) of 1-thia-4-oxo-9,-10-dimethoxy-1,2,-3,4,6,7- hexahydro-llb-H-benzopyridocoline as a yellow solid melting at 13213'5 C.

Analysis.-Calcd. for C14H17NO3SI C, 60.19; H, 6.14; N, 5.02. Found: C, 60.34; H, 6.17; N, 5.83.

Example II The procedure described in Example I is followed except that 3.24 g. (0.02 mole) of 6,7-dihydroxy-3,4- dihydroisoquinoline is reacted with 2.4 g. (0.02 mole) of ,B-mercapto-n-butyric acid to afford I-thia-Z-methyl- 4 oxo 9,10 dihydroxy 1,2,3,4,6,7 hexahydro-llb-H- benzopyridocoline. Similarly, 4.38 g. (0.02 mole) of 6,7-diethoxy-3,4dihydroisoquinoline and 2.68 g. (0.02 mole) of B-mercapto-n-valeric acid react in 50 m1. of benzene to afford I1-thia-2-ethyl-4-oxo 9,10 diethoxy- 1,2,3,4, 6,7-hexahydro-1lb-H-benzopyridocoline. In the same manner and employing equimolar amounts of reactants in each case, 3-methyl-6,7-di(n-butoxy)-3,4-dihydroisoquinoline and ,B-mercapto-n-caproic acid react to afford 1 thia 2 (n-propyl)-4-oxo-6-methyl-9,10-di(nbutoxy) l,2,3,4,6,7-hexahydro-llb-H-benzopyridocoline; 3 ethyl-6,7-di(isoamyloxy)-3,4-dihydroisoquinoline and ,B-mercapto-n-propionic acid react to aiford 1-thia-4-oxo- 6-ethyl-9,10-di(isoamy1oxy) 1,2,3,4,6,7 hexahydro-ldb- H-benzopyridocoline; 6,7-methylenedioxy-3,4-dihydroisoquinoline and fi-mercapto-n-butyric acid react to afford l-thia 2 methy1-4-oxo-9,10-methylenedioxy-l,2,3,4,6,7- hexahydro-l lb-H-benzopyridocoline; 3-(n-butyl) -6,7-dimethyl-3,4-dihydroisoquinoline and fl-mercapto-n-valeric acid react to aiford 1-thia-2-ethyl-4-oxo-6-(n-butyl)-9,-10- dimethyl -1,2,3,4,6,7-hexahydro-1lb-H-benzopyridocoline; 6,7-diethyl-3,4-dihydroisoquinoline and B-mercaptomcaproic acid react to afiord 1-thia-2-(n-propyl)-4-oxo- 9,10 diethyl-l,2,3,4,6,7-hexahyd'ro-Llb-H-benzopyrldocoline; 6,7-di(n-butyl)-3,4-dihydroisoquinoline and Sf-mercapto-n-caprylic acid react to afford 1-thia-2-(n-amyl)-4- oxo-'9,10-di(n butyl)-l,2,3,4, 6,7-hexahydro-l lb-H-benzopyridocoline; and 6,7-di(isoamyl)-3,4-dihydroisoquinoline and fl-mercapto-n-capric acid react to afford 1-thia-2-(nheptyl) 4 oxo-'9,10-di(isoamyl)-1,2,3,4,6,7-hexahydrol lb-H-benzopyridocoline.

Example III In a 65 ml. round-bottomed flask equipped with magnetic stirring apparatus and fitted with a reflux condenser and nitrogen inlet tube, there were placed 4.78 g. (0.025 mole) of 6,7-dimethoxy-3,4-dihydroisoquinoline and 2.42 g. (0.026 mole) of mercaptoacetic acid in 50 ml. of dry benzene. Stirring was then commenced and the resulting yellow-green turbid mixture was placed under a nitrogen atmosphere. As soon as complete solution had occurred (with the aidof gentle heating), the reaction mixture was refluxed for six hours and then allowed to stand for an additional 16 hours at room temperature. Upon completion of this step, the benzene solvent was removed by means of evaporation under reduced pressure to afford a tacky solid, which was subsequently dissolved in 50 ml. of chloroform and allowed to crystallize. In this manner, there was obtained a 64% yield of 1-thia-3-oxo-'8,9-dimethoxy,1,2,3,5,6-pentahydro- IOb-H-benzopyrrocoline in the form of a white crystalline material melting at 1 69-171 C.

Analysis.-Calcd. for C H NO S: C, 58.85; H, 5.70; N, 5.28. Found: C, 59.02; H, 5.70; N, 5.15.

Example IV The procedure described in Example III is followed except that 4.08 g. (0.025 mole) of 6,7-dihydroxy-3,4- dihydroisoquinoline is reacted with 2.7 6 g. (0.026 mole) of a-mercapto-n-propionic acid to afford I-thia-Z-methyl- 3 0x0 8,9 dihydroxy 1,2,3,'5,6 pentahydro 10b- H-benzopyrrocoline. Similarly, 4.78 g. (0.025 mole) of 6,7-diethoxy-3,4-dihydroisoquinoline and 3.12 g. (0.026 mole) of a-mercaptom-butyric acid react to afford l-thia- 2 ethyl 4 3 0x0- 8,9 diethoxy 1,2,3,5,6 pentahydro- 10b-H-benzopyrrocoline. In the same manner and employing appropriate molar amounts of reactants in each case, 3-methyl-6,7-di(n-butoxy)-3,4-dihydroisoquinoline and a-mercaptoisovaleric acid react to alford 1-thia-2- isopropyl 3 oxo 5 methyl 8,9 di(n butoxy)- 1,2,3,5,'6 pentahydro '10b H benzopyrrocoline; 3 ethyl 6,7 di(isoamyloxy) 3,4 dihydroisoquinoline and a-mercapto-n-caproic acid react to afford l-thia-Z- (n butyl) 3 oxo 5 ethyl 8,9 di(isoamyloxy)- :1,2,3,5,6 pentahydro 10b H benzopyrrocoline; 6.7- methy1enedioxy-3,4-dihydroisoquinoline and a-mercapton-caprylic acid react to afford l-thia-2-(n-hexyl)-3-oxo- 8,9 methylenedioxy 1,2,3,5,6 pentahydro 10b H- benzopyrrocoline; and .3-'(n-butyl)-6,7-dimethyl-3,4-dihydroisoquinoline and a-mercapto-n-capric acid react to atford 1- thia 2 (n octyl) 3 oxo 5 (n butyl)- 8,9 dimethyl 1,'2,3,5,6 pentahydro 10b H benzopyrrocoline.

Example V -capto-n-capric acid react to afford naphth-[1,2-a]-2-(nhexyl)-5-oxo-9,10-dihydroxy-2,3,4,5,6,7-hexahydro 11b- H [1,5a]thiazepine; 6,7-methylenedioxy-3,4-dihydroisoquinoline and 'y-mercapto-n-lauric acid react to afford naphth [1,2-a]-2-(n-octyl)-5-oxo-9,10 methylenedioxy- 2,'3,4,5,6,7 hexahydro 11b H [l,5a]thiazepine; 3-(nbutyl)-6,7-dimethy1-3,4 dihydroisoquinoline and -mercapto-n-butyric acid react to afford naphth-[1,2-a1-5-oxo- 6- (n-butyl) 9,10-dimethyI-Z,3,4,5,6,7-hexahydro-1lb-H- [1,5a]thiazepine; 6,7-diethyl-3,4-dihydroisoquinoline and 'y-mercapto-n-valeric acid react to afford naphth-[1,2-a1- 2-methyl-5-oxo-9,l0-diethyl-2,3,4,5,6,7 hexahydro 11b- H- 1,5 a] thiazepine; 6,7-di(n-butyl -3,4,-dihydroisoquino line and v-mercapto-n-caproic acid react to afford naphth- [1,2-a] 2-ethyl-5-oxo-9,l0 di(n-butyl) 2,3,4,5",6,7-hexahydro-11*b-H-[1,5a]thiazepine; and 6,7-di(isoamyl) -3,4- dihydroisoquinoline and 'y-mercapto-n-caprylic acid react to afiord naphth-I1,2-a]-2-(n-butyl)-5-oxo-9,10-di(isoamyl)-2,3,4,5,6,7-hexahydro-11b-H-[1,5a]thiazepine.

Example V] In' a 250 ml. three-necked, round-bottomed flask equipped with magnetic stirring apparatus and fitted with a reflux condenser and nitrogen inlet tube, there were placed 2.46 g. (0.0129 mole) of 6,7-dimethoxy-3,4-dihydroisoquinoline and 2.57 g. (0.015 mole) of o-mercaptobenzoic acid in ml. of benzene. Stirring was then commenced and the entire system was placed under a nitrogen atmosphere. As soon as complete solution was efiected (with the aid of gentle heating), the reaction mixture was refluxed for 21 hours. Upon completion of this step, the benzene solvent was removed by means of evaporation under reduced pressure to aiford a residual dark-green, viscous oil which was subsequently partitioned between 50 ml. of 5% sodium hydroxide and 50 ml. of chloroform. The separated chloroform layer was then washed with one-100 ml. portion of water and subaoeaeaa sequently dried over 'anhydroussodium sulfate. After-removal of the drying agent by means of. filtration, the. dried" filtrate was concentratedin vacuo to 'alforda greenish The. latter substance-wasthen dissolved in a hexane-benzene solution and subsequently allowed to crystallize therefrom- In. this mannegthere yellow viscous oil.

were obtained 2.3 g. (55%) of 1*thia-6-oxo-1L12-dimethoxy- 1 ,6, 8 ,9-tetrahydro-1 3bTH-dibenzo'[ a, g] pyridoco. line as a yellow solid melting at- 102-104 C.

AnalysisCalcd. for C H NO S C, 66.03;1H, 5.24; N, 4.28. Found: C, 66.11; H, 5.46; N, 3.78.

Example VII Theprocedure described in-Example- VI is-"followed oxy)-3,4-dihydroisoquinoline and o-mercapto-fianthranilic acid react to afford l-thia-4-amino-8-ethyl-l1,12-di(iso-- amyloxy) l,6,8,9 tetrahydro 13b H dibenzo[a,g]

pyridocoline; 6,7 methylenedioxy-3,4'dihydroisoquinoline' and o-mercapto-S-salicylic acid react to afiord.1-thia=4-* hydroxy 6 x0 11,12 methylenedioxy 1,6,8,9 tetrahydro-lBb-H-dibenzo[a,=g]pyridocoline; 3 (n-butyl)- 6,7-dimethoxy-3,4-dihydroisoquinoline and o-mercapto-S- methoxybenzoic acid react to afford l-thia-4-methoxy-6 0x0 8 (n bu-tyl) 11,12 dimethoxy 1,6,8,9. tetrahydro-13b-H-dibenzo[a,-g]pyridocoline.

Example VIII To a well-stirred, chilled (0 C.) chloroform solution containing 8.37 g. (0.030mole) of l-thia-4-oxo-9,10-dimethoxy 1,2,3,4,6,7 hexahydro 11b- H benzopyridocoline, there was added 4.2 g..(0.030 mole) of perbenzoic acid dissolved in 501.ml.' of'chloroforrn. After stirring the reaction mixtureat 0 C. for one hour and then at room temperature for an additional hour, the solventwas removed by means of evaporation under reduced pressure and the residual. material extracted with aqueous sodium hydroxide solution in order to remove the benzoic acid; Theso treated material was then takenup in chloroform, filtered and-the resulting filtrate subsequently dried over anhydrous sodium sulfate. Removal of the chloroform from the dried solution in the Similarly, 2.83 g. (0.0129mole) of usual manner afforded the desired 1-thiaoxo-4-oxo-9,10-

dirnethoxy 1,2,3,4,6,7 hexahydro 11b H benzopyridocoline.

In thesame manner, 1-thia-3-oxo-8,9-dimethoxy-l,2,3, 5,6-pentahydro-10b-H-benzopyrrbcoline is-converted to 1-. thiaoxo 3 oxo 8,9 dimethoxy l,2,-3,5,6 pentahY- dro-10b-H-benzopyrrocoline; naphth- [1,2-a-].-5-oxo-9,10- dirnethoxy 2,3,4,5,6,7 hexahydro 11b H [1',5a]thiazepine is converted to naphth-[1,2a]-1,5-'dioxo-9,'10 di* methoxy 2,3,4,5,6,7 hexahydro 11b H- [1,5a]thiazepine; and l-thia- 6-oxo-l'1,IZ-dimethoxy-1,6,8,,9-tetrahydro-13b-I-I-dibenzo[a,g] pyridocoline is converted to 1- thiaoxo 6 oxo 11,12 dimethoxy 1,6,8,9 tetrahyro-l 3b-H-dibenzo[a,g] pyridocoline.

In like manner, all the other l-thia compoundspreviously reportedin the foregoing examples .are cachindiv'idually converted 'to. their. corresponding sulfoxides in accordance with this very same reaction procedure,

8*. Example IX 1 The procedure described in ExampleVIII is*followed except for the fact that the amount of pierbenzoic'acid employed is exactly twice the amount used 'in"the-previous example; in each case; the corresponding dioxosulfur heterocycle is the product obtained; Thus, 1-thia-4-oxo- 9,10 dimethoxy l,2,3,4,6,'7 hexahydro 11b H benzopyridocoline isconverted to 1-thiadioxo-4*-oxo=9",l0- dimethoxy 1,2,3,4 ,6',7 hexahydro 11b'--, H- benzo-' pyridocoline; 1-thia-3-oxo-8,9 dimethoxy-1,2,3,5,6 penta hydro-l0b-H-benzopyrrocoline--is converted to 1-thiadi oxo 3 oxo 8,9 dimethoxy 1,2,3,5,6 pentahydro-10b- H-benzopyrrocoline; naphth [1,2-a]-5-oxo-9,10 dimeth oXy 2,3,4,5,6,7 hexahydro 11b H [1,5a]thiazepine" is converted to 1,-1,S-trioxo-9,'1,0 dimethoxy 2,3,4,5,6,7 hexahydro-l1b-H [1,5a]thiazepine; and 1-thia=6-oxo-11, 12 dimethoxy 1,6',8,9 tetrahydro- 13b I-I"- dibenzo- [a,g]pyridocoline is converted to 1-thiadioxo-6 oxo-1L12 dimethoxy l,6',8,9 tetrahydro l3b' H dibenzo- [-a,g]pyridocoline. In like manner, alLtheother' 1+thia compounds previously reported in the foregoing exam pics are each individually convertedto their' correspond ing sulfones in accordance with this very same-reaction procedure.

Example X A dry solid'pharmaccutical composition was prepared by blending the following materials in 'th'e'proportionsby weight specified:

1 thia 4 oxo 9,10 dimethoxy l,2, 3,4,6,7 -hexahydro 11b H benzopyridocoline' 10 Sodium citrate .50 Alginic acid 20 Polyvinylpyrrolidone- 15 Magnesium stearate' 5 After the dried composition was thoroughly blended,

tablets were punched from the resultingmixture, each tablet being of'such size that it containedSO mg; of the active ingredient. 7

Example XI A dry solid pharmaceutical composition was prepared by combining the following materials in the proportions by weight specified:

1-thia-6-oxo-11,12-dimethoxy 1,2,3,4-tetrahydro-13b- H-dibenzo[a,g]pyridocoline 10' Polyethylene glycol (average molecular weight,

4000) 1 Lactose 40 1 Calcium carbonate 20 Y The dried solid mixture so prepared was "thoroughly agitated so as to obtamapowderedproduct that completely uniform. soft'elasti'c and hard shelled gelatin capsules containing this pharmaceutical composition were then prepared, employing a suflicient quantity of material so as to furnish mg. of the .active ingredient in each capsule.

Example XII An aqueous propylene glycol solution containing-1- thia-3-oxo-8,9-dimethoxy-1,2,3,5,6-pentahydro 10b"- H benzopyrrocoline was preparedby dissolvingthe latter compound in propylene glycol-water (9:1 by weight) with the aid of gentle heating, The amount of compound employed was such that the resulting solution contained 5 mg. of the active ingredient per ml.- After cooling to room temperature, it was sterilized by means .of'

The sterile aqueous filtration through a Seitz filter. propylene glycol solution so obtained was suitable-for intramuscular administration to animals.

What is claimed is:

1. A compound'selected from the'class of organicnitrogen heterocycles corresponding to the wherein R is a member of the group consisting of hydroxy, lower alkoxy and alkyl having from one to five carbon atoms and both R groups taken together form a methylenedioxy group, n is an integer in the range of -2 inclusive, Y is a member of the group consisting of sulfur, oxosulfur and dioxosulfur, Z is a member of the group consisting of hydrogen and alkyl having from one to eight carbon atoms, and R" is a member of the group consisting of hydrogen and lower alkyl.

2. 1-thia-3-oxo-8,9-dimethoxy 1,2,3,5,6 pentahydro- IOb-H-benzopyrrocoline.

3. 1-thia-4-oxo-9,10-dimethoxy 1,2,3,4,6,7 hexahydro-l lb-H-benzpyridocoline.

4. Naphth-[1,2-a]-5-oxo 9,10 dimethoxy-2,3,4,5,6,7- hexahydro-l 1b-H-[ 1,5 a] thiazepine.

5. The process which comprises reacting a 6,7-disubstituted-3,4-dihydroisoquinoline having the structural formula:

wherein R is a member of the group consisting of hydroxy, lower alkoxy and alkyl having from one to five carbon atoms and both R groups taken together form a methylenedioxy group, and R" is a member of the group consisting of hydrogen and lower alkyl, with a mercaptosubstituted lower alkane hydrocarbon carboxylic acid having the general formula HSCHZ(CH COOH wherein n is an integer in the range of 0-2 inclusive and Z is a member of the group consisting of hydrogen and alkyl having from one to eight carbon atoms, said reaction being conducted in a reaction-inert organic solvent medium at a temperature that is in the range of from 20 C. to about 150 C. for from about two to about 24 hours.

6. A compound selected from the class of organic nitrogen heterocycles corresponding to the structural formula:

wherein R is a member of the group consisting of hydroxy, lower alkoxy and alkyl having from one to five carbon atoms and both R groups taken together form a. methylenedioxy group, Y is a member of the group consisting of sulfur, oxosulfur and dioxosulfur, R is a member of the group consisting of hydrogen, methyl, chlorine, bromine, amino, hydroxy and methoxy, and R" is a member of the group consisting of hydrogen and lower alkyl.

7. l-thia-6-oxo-l1,12-dimethoxy 1,6,8,9 tetrahydro- 13b-H-dibenzo[a,g]-pyridocoline.

8. 1-thia-4-chloro 6 oxo 11,12 diethoxy 1,6,8,9- tetrahydro-13b-H-dibenzo [a,g] pyridocoline.

9Q 1-thia-4-hydroxy 6 oxo 11,12 methylenedioxy- 1,6,8,9-tetrahydro-l3b-H-dibenzo[a,g]pyridocoline.

10. The process which comprises reacting a 6,7-disubstituted-3,4-dihydroisoquinoline having the structural formula:

wherein R is a member of the group consisting of hydrogen, methyl, chlorine, bromine, amino, hydroxy andmethoxy.

No references cited. 

4. NAPHTH-(1,2-A)-5-OXO-9,10-DIMETHOXY-2,3,4,5,6,7HEXAHYDRO-11B-H -(1,5A)THIAZEPINE. 